Exchange 2010 message tracking power-shell filter(s)

Hi.

I'm looking for Exchange 2010 message tracking power-shell filter(s) that will show all emails sent from the local domain, within a specific time frame, to all external domains, excluding all emails sent to recipients within the local domain. Basically, any email sent outside of the organisation over a period of 3 days. There are too many emails to go through if I just do a standard search-all.

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